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Hopkinton climate
Typical historical weather for Hopkinton, United States, averaged across 10 years of hourly climate data. Pick a date for a specific day.
Data last updated: 31 December 2025
Want today's actual conditions instead? See the current forecast for Hopkinton. Planning a garden? See the gardening & growing season planner. Or browse the 365-day climate calendar.
Annual average
11.7°C
across all months
Warmest month
27.1°C
Jul average high
Coolest month
-2.9°C
Jan average low
Annual rainfall
1220mm
total per year
Hopkinton is typically hottest in July and coolest in January, a swing of about 30°C across the year. About 28% of annual rainfall falls in the three wettest months (December is typically wettest, June driest).
Monthly averages
Average daily high/low temperature (band) and monthly rainfall (bars).
| Month | Avg high | Avg low | Rainfall | Wet days | Humidity | Wind | Cloud | Solar |
|---|---|---|---|---|---|---|---|---|
| Jan | 3.7°C · record 9.7°C–18.9°C | -2.9°C · record -19.5°C–-2.9°C | 104mm | 10 | 67% | 4.1 m/s | 57% | 2 kWh/m² |
| Feb | 5.2°C · record 9.6°C–17.5°C | -2°C · record -22.9°C–-7.8°C | 93mm | 10 | 68% | 4 m/s | 60% | 2.9 kWh/m² |
| Mar | 8.4°C · record 13°C–18°C | 1.2°C · record -11.5°C–-1.9°C | 107mm | 11 | 62% | 4.2 m/s | 58% | 4.1 kWh/m² |
| Apr | 12.9°C · record 16°C–28.1°C | 5.8°C · record -4.1°C–2.5°C | 108mm | 12 | 65% | 3.9 m/s | 63% | 5 kWh/m² |
| May | 18.3°C · record 21.9°C–30.6°C | 10.9°C · record 2°C–6.9°C | 102mm | 12 | 71% | 3.4 m/s | 65% | 5.7 kWh/m² |
| Jun | 23.5°C · record 26.3°C–35.5°C | 16.1°C · record 8.2°C–12.6°C | 81mm | 10 | 74% | 3.2 m/s | 60% | 6.3 kWh/m² |
| Jul | 27.1°C · record 30.6°C–35.5°C | 20.2°C · record 13.7°C–17.4°C | 112mm | 13 | 77% | 3 m/s | 59% | 6.1 kWh/m² |
| Aug | 26.4°C · record 28.4°C–33.1°C | 19.4°C · record 12.3°C–16.3°C | 96mm | 11 | 76% | 3 m/s | 57% | 5.5 kWh/m² |
| Sep | 22.7°C · record 26°C–32.8°C | 15.7°C · record 7.1°C–11.6°C | 98mm | 10 | 78% | 3.2 m/s | 58% | 4.2 kWh/m² |
| Oct | 17.6°C · record 21.9°C–28.3°C | 10.3°C · record -2.6°C–5.8°C | 111mm | 10 | 76% | 3.7 m/s | 53% | 3 kWh/m² |
| Nov | 11.5°C · record 17.1°C–24.3°C | 3.7°C · record -9.4°C–-0.4°C | 86mm | 9 | 68% | 4 m/s | 46% | 2.3 kWh/m² |
| Dec | 5.9°C · record 13.3°C–16.9°C | -0.7°C · record -14.4°C–-5.8°C | 123mm | 10 | 70% | 3.9 m/s | 56% | 1.7 kWh/m² |
"Avg high"/"Avg low" is the mean daily high/low for that month, averaged across every year on file. The "record" figure alongside it is a different statistic — the single hottest (or coldest) hour ever recorded during that month across all years — so it can sit above or below the average and does not describe the average's year-to-year spread. A "wet day" is any day with at least 1.0mm of rain.
Year to year
Annual average temperature, 2016–2025.
Across these 10 years, the annual average has moved by about +0.3°C per decade. That’s a short window for a reliable long-term climate trend — treat it as indicative, not definitive.
Annual rainfall has moved by about -173.87mm per decade over the same period.
2025 (the most recent year on file) averaged 11.2°C, below the 9-year baseline of 11.8°C by 1.69 standard deviations.
Typical extremes per year
Rainy days
127.6 days
≥1.0mm rain
Heavy rain days
15.1 days
≥20mm rain
Extreme heat days
0 days
daily high ≥40°C
Frost days
75.1 days
daily low ≤0°C
Averaged across 10 years on file. Thresholds match PastClimate's data pipeline definitions — see data & sources.
Records on file
Ranked across 10 years of data currently on file (2016–2025).
Hottest day
35.5°C
28 July 2020
2020 was 0.87 SD above the 9-year average that year
Coldest day
-22.9°C
14 February 2016
2016 was 0.17 SD above the 9-year average that year
Wettest day
91.2mm
11 December 2024
2024 was 0.42 SD above the 9-year average that year
Windiest day
10.9m/s
2 March 2018
2018 was 0.77 SD below the 9-year average that year
See the detail: Hopkinton on 11 December 2024.
Nearby cities
Frequently asked questions about Hopkinton's climate
What is the hottest month in Hopkinton?
July is typically the warmest month in Hopkinton, with an average high of 27.1°C. January is typically the coolest, averaging -2.9°C overnight.
How much does it rain in Hopkinton?
Hopkinton gets about 1220mm of rain a year on average, with roughly 28% of it falling in the three wettest months (December is typically the wettest, June the driest).
How many extremely hot or cold days does Hopkinton have?
On average, Hopkinton sees about 0 day(s) a year at or above 40°C and about 75.1 day(s) at or below 0°C, based on 10 years of data.
Is Hopkinton getting warmer?
Across the 10 years on file (2016–2025), the annual average temperature has moved by about +0.25°C per decade. That's a short window for a reliable long-term climate trend — treat it as indicative, not definitive.
What is the hottest day on record for Hopkinton?
The hottest day on file is 28 July 2020 at 35.5°C, out of 10 year(s) searched.
Data & provenance
↓ Download monthly CSVData source & coverage — ERA5 reanalysis, 2016–2025 (10 years)details
- Source
- ERA5 reanalysis, accessed via the Copernicus Climate Change Service (C3S) Climate Data Store
- Data type
- Reanalysis — a physically consistent reconstruction combining a forecast model with historical observations, not a live station reading or a forecast
- Coverage
- 2016–2025 (10 years) for United States
- Location
- Hopkinton — 41.500°, -71.750°, ERA5 grid cell center, 4.9 km from requested point
- Time zone
- America/New_York
- What's shown here
- Monthly and annual averages, and dated extreme-value records, derived from an hourly base record.
- Spatial resolution
- 0.25° (~25 km) distributed grid — ERA5's native model resolution is finer; this is the publicly distributed regridded product
- Version / refreshed
- Methodology v2026.07 · data last refreshed December 31, 2025
- Limitations
- A model reconstruction, not a station observation — hyper-local extremes (a single storm cell, an urban heat pocket) can differ from a nearby gauge. See the full methodology.
- Attribution
- Generated using Copernicus Climate Change Service information
Cite this data
PastClimate (2026-07-21). Historical climate data for Hopkinton, United States (41.50°N, 71.75°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Hopkinton, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 21, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Hopkinton, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 21, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Hopkinton, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-21},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.